1 scie311 industrial & environmental biotechnology biomining and bioleaching of ores ms. grace n. ijoma key concepts • bioleaching • biomineralization • biooxidation bioleaching • the dissolution of metals from their mineral source by certain naturally occurring microorganisms or • the use of microorganisms to transform elements so that the elements can be extracted from a material .
2001. leaching of nickel and iron from greek non-sulphide nickeliferous ores by organic acids. pg tzeferis, s agatzini-leonardou. hydrometallurgy 36 (3), 345-360. , 1994. 86. 1994. leaching of a low grade hematitic laterite ore using fungi and biologically produced acid metabolites. pg tzeferis.
A process for leaching an ore that contains nickel and magnesium includes mixing a microorganism that is capable of producing an organic acid, a nutrient, and an ore that contains nickel and magnesium for a period of time to dissolve the nickel and form a solution containing a nickel salt and a magnesium salt, separating the nickel from the magnesium in the salt solution.
A review has been completed of current and proposed processing technologies for nickel laterite ores. although future supplies of nickel depend on laterite ores, their processing is inherently energy intensive and expensive as, unlike sulphide ores, they cannot be significantly upgraded, meaning the entire ore needs to be treated in the process.
Abstract. in this research, the biological leaching of nickel by indigenous fungi isolated from indonesian limonite was studied to develop a feasible technique for microbial recovery of nickel from low grade nickel ore. xrd analyses indicated that goethite, alumina and quartz were major mineral composition of the ore.
Aspergillus niger is a prominent fungi that has been used for bioleaching of nickel laterite ore and commercial production of citric acid. series of shake flask bioleaching assays have been conducted to study the effects of ore type, ore particle size distribution, solid percentage, and substrate volume percentages as well as sulphur addition on the nickel extraction from indonesian laterite ore.
tang and m. valix, “ leaching of low-grade nickel ores by fungi metabolic acids,” in new perspectives on very large-scale operations, separation technology vi, edited by c. fell, et al. (eci symposium series, australia, 2004), pp 1– 16.
Citric acid has been proved to be the most effective organic acid for nickel extraction from nickel lateritic ores. citric acid can be produced from fungal metabolism by utilizing several types of carbon source as fungal nutrient. in the current experiment, production of metabolic citric acid from metabolism of aspergillus niger by using corn starch as a carbon source was investigated.
therefore, the indirect bioleaching of low-grade nickel lateritic ores using fungal metabolic organic acids by the chemoorganotrophic fungus aspergillus niger was established in this study with the following reasons, (1) chemoorganotrophic leaching microbes are able to grow in a less selective environment and have a high tolerance compared with acidophilic chemolithoautotrophs so .
Effect of acids type on leaching. fig. 1 shows the percentage leaching of nickel for different acids at time intervals of 40, 80 and 120 h at a concentration of 1 m. from the figure, it is evident that oxalic acid is the most efficient leaching agent compared to the other two acids (figure 1).this may be due to the fact that the extent of dissolution is dependent on the acid activity (tang and .
chaerun sk, minwal wp, mubarok mz (2017) indirect bioleaching of low-grade nickel limonite and saprolite ores using fungal metabolic organic acids generated by aspergillus niger. hydrometallurgy 174:29–37 crossref google scholar.
Fungi are heterotrophic and do not perform photosynthesis (glazer and nikaido, 2007). these microorganisms secrete hydroxycarboxylic acids which dissolve nickel .
Heterotrophic fungi involving the use of fungal metabolic acids has been attempted. higher recoveries have been attained in the field of metal extraction from low-grade non-sulphidic ores using .
In this research, the biological leaching of nickel by indigenous fungi isolated from indonesian limonite was studied to develop a feasible technique for microbial recovery of nickel from low grade nickel ore. xrd analyses indicated that goethite, alumina and quartz were major mineral composition of the ore.
Including cu and ni from copper-nickel concentrates, cu from low-grade copper ore, uranium from granites, and potassium from leucite. microbially produced dicarboxylic acids, oxalic, isocitric, citric, succinic, ketogluconic acid, polyhydroxy acids, and phenolic compounds such as.
Indirect bioleaching of low-grade nickel limonite and saprolite ores using fungal metabolic organic acids generated by aspergillus niger siti khodijah chaerun a,b,⁎ , robi suryaning sulistyo c .
fungi can produce certain organic acids, amino acids, and other metabolites, which are involved in leaching from ores (table 1). these metabolites dissolve metals either by metal ion displacement from the ore via hydrogen ion or by chelates creation and solubilize metals.
for such ores, research is being done on the use of heterotrophic bacteria and fungi. in this case metals are dissolved by organic acids or complexing or chelating agents produced by the bacteria or fungi . studies on silicate nickel ores have shown that nickel is dissolved by organic acids produced by microorganisms.
microbial leaching of non-sulphide ores, especially oxides and silicates, represents a new these ores, including laterites, chemoorganotrophic leaching using fungi is necessary. this is because the organic acids metabolically produced by fungi have a dual effect of providing hydrogen ions for acidolysis of minerals and complexing metals due to their chelating capacity .
the results showed that extensive low-grade laterite domestic sources are generally amenable to bioleaching when micro-organisms were cultivated in the presence of the ore. nickel recoveries were as high as 60% using hydroxycarboxylic acid producing strains of aspergillus and penicillium codes a3, p2. cobalt recovery achieved was around 50%.
Kinetics of limonite and nontronite ore leaching by fungi metabolic acids. was successfully achieved within a 300 d leaching process from the jinchuan low grade nickel sulfide mineral ore .
Leaching of low grad e limonite and nontronite ores by fungi metabolic organic acid on nickel extraction from low-grade indonesian saprolitic ores was evaluated. acids, can extract nickel .
Leaching of low grade limonite and nontronite ores by fungi metabolic acids j.a. tang and m. valix (university of sydney, australia) bioleaching nickel laterite ores using multi-metal tolerant aspergillus foetidus organism l. le, j. tang, d. ryan and m. valix (university of sydney, australia).
Leaching of low grade limonite and nontronite ores by fungi metabolic acids j.a. tang and m. valix (university of sydney, australia) studies concerning nickel electrowinning from acidic and alkaline electrolytes m. pasquali and c. lupi (university of rome “la sapienza”, italy).
Leaching of low grade limonite and nontronite ores by fungi metabolic acids. minerals engineering, 2006. m. valix. j. tang. m. valix. j. tang. download pdf. download full pdf package. this paper. leaching of low grade limonite and nontronite ores by fungi metabolic acids .
Leaching of low grade nickel ores by fungi metabolic acids more. by jessica tang. publication date: 2006 • using halotolerant aspergillus foetidus in bioleaching nickel laterite ore more. by jessica tang. publication date: 2009.
Leaching of low- grade nickel ores by fungi metabolic acids . by jessica tang and marjorie valix. get pdf (912 kb) abstract. this study was designed to investigate the nature of nickel and cobalt dissolution from limonite and weathered saprolite ores. chemical leaching was conducted using 1 to 3m of citric, lactic and malic acids.
Leaching of low- grade nickel ores by fungi metabolic acids jessica tang and marjorie valix department of chemical engineering university of sydney, nsw, 2006, australia t: +61(0)2 9351 4995; f: +61(0)2 9351 2854; e: mvalix abstract this study was designed to investigate the nature of nickel and cobalt dissolution.
Leaching of low-grade nickel ores by fungi metabolic acids. 2004 eci conference on separations technology vi: new perspectives on very large-scale operations, online: the berkeley electronic press. deepatana, a., valix, m. (2006). recovery of nickel and cobalt from organic acid complexes using aminophosphonate chelating resin.
leaching low-grade nickel ores by fungi metabolic acids c. fell , g.e. keller ii (eds.) , 2004 engineering conferences international (eci) conference on separations technology vi: new perspectives on very large scale operations , berkeley electronic press ( 2006 ).
tang j, valix m (2004) leaching of low-grade nickel ores by fungi metabolic acids. in: refereed proceedings separations technology vi: new perspectives on very large-scale operations. eci digital archives. tuttle jh, dugan pr, apel wa (1977) leakage of cellular material from thiobacillus ferrooxidans in the presence of organic acids. appl .
Processing Capacity: 120-1600 t/h
Feeding Size: ≤1000mm
Briquette Ratio:Above 90%
Product Warranty: One Year
Feeding Granularity: 300-1050mm
Processing Ability:0.2–16 m³/min
Processed Materials: Non-ferrous metal minerals such as copper, lead, zinc, molybdenum, cobalt, tungsten, antimony etc.